/*!	 synfig/rendering/primitive/mesh.h
**	 Mesh Header
**
**	......... ... 2015 Ivan Mahonin
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifndef __SYNFIG_RENDERING_MESH_H
#define __SYNFIG_RENDERING_MESH_H

#include <cstring>

#include <vector>

#include <ETL/handle>

#include <synfig/rect.h>
#include <synfig/matrix.h>

namespace synfig
{
namespace rendering
{

class Mesh: public etl::shared_object
{
public:
    typedef etl::handle<Mesh> Handle;

#pragma pack(push, 1)
    struct Vertex {
        Vector position;
        Vector tex_coords;
        Vertex() { }
        Vertex(const Vector &position, const Vector &tex_coords):
            position(position), tex_coords(tex_coords) { }
    };
#pragma pack(pop)

    struct Triangle {
        int vertices[3];
        Triangle()
        {
            memset(vertices, 0, sizeof(vertices));
        }
        Triangle(int v0, int v1, int v2)
        {
            vertices[0] = v0;
            vertices[1] = v1;
            vertices[2] = v2;
        }
    };

    std::vector<Vertex> vertices;
    std::vector<Triangle> triangles;

private:
    mutable Rect source_rectangle;
    mutable Matrix2 resolution_transfrom;
    mutable bool resolution_transfrom_calculated;

public:
    Mesh(): resolution_transfrom_calculated(false) { }

    void reset_resolution_transfrom()
    {
        resolution_transfrom_calculated = false;
    }

    void calculate_resolution_transfrom() const;

    void recalculate_resolution_transfrom()
    {
        reset_resolution_transfrom();
        calculate_resolution_transfrom();
    }

    const Matrix2& get_resolution_transfrom() const
    {
        if (!resolution_transfrom_calculated) {
            calculate_resolution_transfrom();
        }

        return resolution_transfrom;
    }

    const Rect& get_source_rectangle() const
    {
        if (!resolution_transfrom_calculated) {
            calculate_resolution_transfrom();
        }

        return source_rectangle;
    }
};

} /* end namespace rendering */
} /* end namespace synfig */

#endif